// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

namespace Textile.States;

public class TableCellParser
{
    readonly string _lineFragment;

    public TableCellParser(string input)
    {
        _lineFragment = input;
    }

    public string GetLineFragmentFormatting()
    {
        var htmlTag = "td";

        var m = Regex.Match(_lineFragment,
                                @"^((?<head>_?)" +
                                Globals.SpanPattern +
                                Globals.AlignPattern +
                                Globals.BlockModifiersPattern +
                                @"(?<dot>\.)\s?)?" +
                                @"(?<content>.*)"
                                );
        if (!m.Success)
        {
            throw new Exception("Couldn't parse table cell.");
        }

        if (m.Groups["head"].Value == "_")
        {
            htmlTag = "th";
        }
        //string opts = BlockAttributesParser.ParseBlockAttributes(m.Groups["span"].Value, "td") +
        //              BlockAttributesParser.ParseBlockAttributes(m.Groups["align"].Value, "td") +
        //              BlockAttributesParser.ParseBlockAttributes(m.Groups["atts"].Value, "td");
        var opts = BlockAttributesParser.ParseBlockAttributes(m.Groups["span"].Value + m.Groups["align"].Value + m.Groups["atts"].Value, "td");

        var res = "<" + htmlTag + opts + ">";
        // It may be possible the user actually intended to have a dot at the beginning of
        // this cell's text, without any formatting (header tag or options).
        if (string.IsNullOrEmpty(opts) && htmlTag == "td" && !string.IsNullOrEmpty(m.Groups["dot"].Value))
        {
            res += ".";
        }

        res += m.Groups["content"].Value;
        res += "</" + htmlTag + ">";

        return res;
    }
}